Ovarian cancer is characterized by its early metastasis and peritoneal dissemination. Their prognosis is very bad among other gynecological malignancies. So, we need to clarify the mechanism of pathogenesis and metastasis. We found the expression of OCT4, which is one of Yamanaka factors. We are aimed to detect changes of ovarian cancer cell lines by gene expression of Yamanaka factors. We also present the possibility of the important role of TGF-b pathway for the metastasis of ovarian cancer.